Matias Catarina N, Santos Diana A, Gonçalves Ezequiel M, Fields David A, Sardinha Luís B, Silva Analiza M
Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002 Cruz-Quebrada, Portugal.
Ann Hum Biol. 2013 Mar;40(2):152-6. doi: 10.3109/03014460.2012.750684. Epub 2012 Dec 19.
Bioelectrical impedance spectroscopy (BIS) provides an affordable assessment of the body's various water compartments: total body water (TBW), extracellular water (ECW) and intracellular water (ICW). However, little is known of its validity in athletes.
To validate TBW, ECW and ICW by BIS in elite male and female Portuguese athletes using dilution techniques (i.e. deuterium and bromide dilution) as criterion methods.
Sixty-two athletes (18.5 ± 4.1 years) had TBW, ECW and ICW assessed by BIS during their respective pre-season.
BIS significantly under-estimated TBW by 1.0 ± 1.7 kg and ICW by 0.9 ± 1.9 kg in relation to the criterion methods, with no differences observed for ECW. The values for the concordance correlation coefficient were 0.98 for TBW and ECW and 0.95 for ICW. Bland-Altman analyses revealed no bias for the various water compartments, with the 95% confidence intervals ranging from - 4.8 to 2.6 kg for TBW, - 1.5 to 1.6 kg for ECW and - 4.5 to 2.7 kg for ICW.
Overall, these findings demonstrate the validity of BIS as a valid tool in the assessment of TBW and its compartments in both male and female athletes.
生物电阻抗光谱法（BIS）能对人体不同的水分区间进行经济实惠的评估，包括总体水（TBW）、细胞外液（ECW）和细胞内液（ICW）。然而，其在运动员中的有效性鲜为人知。
以稀释技术（即氘和溴化物稀释）作为标准方法，通过BIS对葡萄牙优秀男女运动员的TBW、ECW和ICW进行验证。
62名运动员（18.5±4.1岁）在各自赛季前通过BIS对TBW、ECW和ICW进行评估。
与标准方法相比，BIS显著低估了TBW 1.0±1.7千克，低估了ICW 0.9±1.9千克，而ECW未观察到差异。TBW和ECW的一致性相关系数值为0.98，ICW为0.95。Bland-Altman分析显示，各水分区间均无偏差，TBW的95%置信区间为-4.8至2.6千克，ECW为-1.5至1.6千克，ICW为-4.5至2.7千克。
总体而言，这些发现证明了BIS作为评估男女运动员TBW及其区间的有效工具的有效性。
